Fan for grain-separators



2 Sheets-Sheet 1.

(No Model.)

J. BAGHMAN.

FAN FOR GRAIN SEPARATORS, &c.

Patented Jan-.Z3,1883.

RQQMEE? N. PETERS. vlwm-mho m hm, Washmghm. D c

2 S'hets- She t 2.

{No Model.)

BAGHMAN. v FAN FOR GRAIN SEPARATORS, 650.

No. 270,882. Patented J-an.Z 3, 1883.

r: m-rzns. mom L'rthognphcr. Wuhingtcn. n. c.

UNITED STATES PATENT Grates.

JACOB BAOHMAN, OF STONY RUN, PENNSYLVANIA.

FAN FOR GRAlN-SEPARATORS, 80C.

SPECIFICATION forming part of Letters Patent No. 270,882, dated January 23, 1883. h

Application filed May 23, 1882. (No model.)

To all whom it may concern Be it known that 1, JACOB BACHMAN, a citizen of the United States, residing at Stony Run, county of Berks, and State of Pennsylvania, have invented a new and useful Improvement in Fans for Grain-Separators and LikeMachines,ofwhichthefollowingisaspecification.

Referring to the drawings herewith, forming a part of this specification, and in which the same letters refer to the same or corresponding parts in all the figures, Figure 1, Sheet 1,

represents a general sectional elevation of a separator, as adapted to receive my improved fan, which is shown therein in dotted lines. Fig. 2, Sheet 1, is a plan, partly in section, of the shaft, fan, and frictional device. Fig. 3, Sheet 1, are details in elevation and section, showing more clearly the construction of the parts. Fig.4, Sheet 2, is a general sectional elevation of a separator with the governor in place, the fan being removed to show more clearly the eccentric suspension of the arms. Fig. 5, Sheet 2, is a plan of the governor detached from the case; Fig. 6, Sheet 2, right and left hand end views of the governor-arms, and front and side elevations of the shaftbearings, showing the pivotal support for the arms in the ears of the caps eccentric to the shaft.

In all the drawings, A represents the shaft as a whole; A, a central boss on the same; A screw-threaded portions; A a groove in each of said screw-threaded portions for a spline; B, sleeves sliding freely over the screw-threaded portion; B, perforated ears formed thereon; B links for connecting said ears with fanblades, and B a circumferential groove at one end of the same; 0, a nut fitted to each of the screw-threaded portions of the shaft; 0, annular shoulders on the same; 0 set-screws with rounded points fitting into grooves B of the sleeves; ,D, a crank-disk connected in the usual manner with the screen-shoe.

E represents the spider-boss, and E the arms of the spider, to which the fan-blades are secured. I

F represents the main fan-blades, and F the supplemental blades, which are fuloruined at F and, by pin-connection at B and links B are connected with the sleeves.

G is a frictional hub of a power-receiver.

H is a friction-washer; I, a spring, and J a washer-headed set-screw.

K K are the arms of the speed-governor; K fulcrum-pins; K transverse blades, having angular lips; K, a seat fora brake-block, extended at right angles from the arm K on the side next to the fixed collar A and K is the brake-block; K a counterpoise-lever, projected at right angles from the arm K, and

then turned parallel with the same on the outside of the case; K the counterpoise.

L represents stops onthe inside of the case;

M, supports for the journaLbOXes; N, thejournal-boxes, provided with ears N on the inner faces of the caps, which are perforated to receive the fulcrum-pins K of the governor, the

arms of which are bent, as shown, so as to surfaces A each side of the central raised portion, provided with the usual journals, and a groove, A longitudinally of the shaft, through each of the screwed surfaces; a collar, A, secured with a set-screw with sunken head; at one end of the shaft a crank-disk, D, keyed thereon; at the other end a friction-hub, G,.revolving freely on the shaft in contact with the collar A and projecting slightly beyond the end of the same. The shaft is drilled and tapped at this same end to receive a set-screw, J, which is provided with a washer-head having finger-wings on the same. A washer, H, slides freely on the set-screw, said washer being made as large in diameter as the frictionhub, and the head of the set-screwas large in diameter as the spring I, which is placed between the head of J and the washer H prior to the insertion of the set-screw into the end of the shaft.

,Secondl y. The spider of the fan is constructed with a central boss, E, from which are projected four or more arms, E, said arms being bifurcated where they are attached to the main blades, and are so projected that the blades,

when secured thereto, shall have nearly a tangential direction from the periphery of the shaft. A fulcrum-pin, F is placed in the arms for the supplemental blades. The main blades are made preferably of the form shown, being rectangular in form, minus triangular pieces taken from the inner edge, the base of which equals about one-halt the depth of the blade, and the hypotenuse ending on the inner edge at the center of the blades length. For a purpose disclosed farther on, I place upon each of the main blades a pair of supplemental blades, F, fulcrumed at F provided with pins B and links B and in form corresponding with the removed portions of the main blades, placed on the line of the hypotenuse, with not less than one and one-half inch additional width for lap.

Third. Sleeves B are placed on the shaft, one each side of the central boss, A, and are bored to slide ireely over the screwed surfaces. They are each provided with a spline, Bflwhich slides freely in the groove A and thus prevents indepcndentrotationofthesleeve. Thesleeves have perforated ears B, adapted to connect with thelinks B and at the opposite end, upon the periphery, a circumferential groove, B This end of the sleeve abuts against the nuts 0, and when in said position the circumferential groove B is in line with the set-screw (J of the same.

Fourth. The nuts 0 are fitted to the threaded portion A of the fan-shaft, and are provided with annular shoulders O, titted to receive the ends of the sleeves B,and having round-pointed set-screws (J in the same, the sleeves having their ends inserted in the annular shoulders. The circumferential-groove B coincides with the point of the set-screw G which is lightly screwed therein, which engages the sleeve and nut, and when the nut is turned (the sleeve being prevented from turning by the spline) the sleeve has a longitudinal motion given to it upon the shaft.

Fifth. The collar A is made separate from the shaft to permit the introduction of the sleeve and nut upon the same, and, in order to secure both face and peripheral friction-surface, is made in diameter equal to the hub of the friction device, and in width not less than two inches. It may be secured to the shaft by a pin passing entirely through both collar and shaft, or by a set-screw with countersunk head, the periphery in either case to be left smooth. The hub Gr may be put in motion by belt or gear, and will transmit more or less of the same to the shaft A, dependent upon the force brought to bear upon the spring I and washer H by the manipulation of the set-screw J, and

although the motor may drive the hub at the speed due its connection therewith, the setscrew J may be so adjusted in the shaft A as not to create frictional contact between the hub G, collar A, and washer H. The result would be an entire stoppage of the fan.

Sixth. The governor in the form of a parallelogram is constructed with two bent arms, K

K, as shown, which are suspended over the shaft, within the case 0, by pins K fitting loosely in the ears N of the caps of the bearings N, the arms being so arranged that they will within certain limits oscillate without contact with the shaft. At the extremities of the arms transverse blades K are secured, having right-angled (outer) lips projected toward the current of air set in motion by the fan. The arm K has, forming part of the same, an arm, K carried through the caseO, and of such length that a brake-block, K secured to the same, will coincide with the periphery of the shaft-collar A, and in certain contingencies come into contact with the same. The opposite arm, K, has also projected from it, on the side of the shaft A opposite to the brake-block K, a counterpoiselever, K provided with a weight, K. Said arm. is first carried through the case and then bent parallel therewith, at such distance therefrom as will keep the weight K clear of the same.

The operation of the several parts is as follows: The fan-shaft, by any ofthe usualmodes of hand or power mechanism,is made to revolve against the sun, which throws the blast up through the screens, and i'sin this respect similar to the fans at present in use, which fans do not give the operator the desired control of the blast without recourse to a multiplicity of slides and wind-boards, and these only regulate the force of the blast vertically. From various causes separators as set up usually have an abundant current of air central to the screens, but fail to clean well at the sides, while wind-boards projected within the case, so as to deflect the blast and correct this evil, would cut the air ofi from the screen on the projected side and concentrate the blast upon the remaining exposed portion of the screens. To obviate this, I introduce the supplemental blades F, connected, as shown, by links B, with the sleeves B, and the latter with the nuts 0 through their annular shoulders O and set screw C the result of the connection being that if the nuts 0 are turned to the right or left on the screwed surfaces A of the shaft A the sleeves, being connected therewith,

will partake of their longitudinal movement, (being prevented from turning by a spline, B 1n the groove A and the alternate motion thus received is, through the link-connection B with the sleeves and supplemental blades, imparted to the latter, causing their free ends to rise or fall,'tl1us increasingor narrowing the width of the compound blade, the result of which is that if both nuts are screwed at the same time, so as to bring the blade to a uniform or parallel width, or so that the shape shall conform to that of the main blades, then the blast will be delivered with an effect varying from a uniform vertical and lateral current to one gradually decreasing from the center of the fan to the sides, and if the nut on one side only is manipulated, and the supplemental blade thereby dropped below the edge of the main blade, and its width thus increased, a

IIO

35 ment.

frame therefore eccentric to the same.

be regulated without any other contrive-nee,

and without interfering with the satisfactory working of the central portions of the screens' 1 o It is desirable, in cleaning grain or seeds, to be I able to moderate or decrease the speed of the fan, to adapt the same to the various conditions of the grain to be cleaned. This I attain by the friction device shown. The hub of the t5 pulley or gear through which the shaft A is driven runs loosely upon the end of the shaft, and with its hub-face in contact with the collar A Resting against the outer face of the hub G is a washer, H ,thelatter strungloosely upon the set-screw J, the latter having a head of size sufficient to seatastronghelical or gum spring, I, placed between it and the washer H. The set-screw is threaded into the end of the shaft A, and the-turning of the screw increases the frictional contact ofthe collar, hub, and washer;

or the reverse operation diminishes the friction of said contact. This will give, according to requirements, a varying speed of fan, from a dead stop to the full speed due to the 0 connection with the motor, without any change of speed in the motor.

' It is also desirable with small seeds to clean to have the power of securing a uniform speed of fan, the motor being irregular in its move- This .I attain by the use of the governor constructed as shown, the same being suspended from thecaps N on pivotal ears N, the blade ends parallel with thehorizontal center of the fan-shaft, and the motion of the The brake K on the arm K is eounterpoised by the weight K" and lever K on the arm K, and in this condition the blast would act upon the blades K depressing the rear end of the governor, and the brake K would be kept continually in contact with the collar A, and the motion of the fan would be retarded; buton shifting the counterpoise farther away from the center of the shaft the arms K K will be depressed in the opposite direction, which will block K against the collar A and thus keep up a uniform motion of the fan. Stops L at the sides of the case limit the movement of the blades K so that, the weight K being properly placed, the speed is maintained within desirable limits.

Having described my invention and shown its application and advantages, I desire to secure by Letters Patent the following claims:

1. The combination, with fan-shaftA,formed with a'screw-threaded portion, A and groove A of spider E E, blades F, supplemental blades F, link B movable sleeve B, a spline, B, for preventing the rotation of sleeve B, not 0, and means for clutching the nut and sleeve together at will, substantially as shown I and described.

2. The combination, with the fan-shaft A, serewthreaded and grooved, as described, of spider E E, blades F, supplemental blades F, pivoted thereto, links B movable sleeve B, formed witha circumferential groove, B a

spline, B, for preventingthe rotation of sleeve B, nut 0, formed with an annularshoulder, O, fitting over sleeve B, and a set-screw, 0 for engaging and disengagingthe nut and sleeve, substantially as and for the purpose set forth.

3. The combination, with fan shaft A, grooved and screw-threaded, as described, ot' movable blade F, sleeve B, formed with acircumferential groove, B and connected with blade F, a spline, B, for keying sleeve B on the fan-shaft, while permitting its longitudinal movement thereon, nut 0, formed with annular shoulder G, fitting over sleeve B, andasetscrew, 0 for engaging and disengaging the nut and sleeve, substantially as and forv the purpose specified.

at. The combination, with the fan-blades and fan-shalt, of acollar, A", rigidly secured on said shaft, hub G, mounted loosely on said shalt and projecting somew hat beyond the end thereof,washer H, spring I,and set-screw J, whereby the veloeity of the fan is rendered variable independently of thatof the motor, substantially as shown and described.

5. The combination of the fan-blades F F, the fan-shaft A, the arms K K, fnlcrums or pivots K for said arms, eccentric to the fanshaft, ears N and bearin gs N, the transverse blades K formed with angularlips,brake-arm K, brake-block K and connterpoise K K whereby the velocity of the fan is rendered uniform independently of change of speed in the motor, substantially as and for the purpose set forth.

JAGOB BAOHMAN. Witnesses:

F. PIERCE HUMMEL, THOMAS P. KINsEY. 

